This shows the tube outlet into the right hand "stream." It's a 1/2 tube to reduce the main 5/8" tube from the fountain pump. The two water openings, into the "waterfall" on the left and the stream on the right are on the same loop of tubing. Openings are merely adjusted so each gets the right amount of water flowing back into the pond and pump.
I hope some of you will try this and have as much fun with it as I did. Patty